[teiid-issues] [JBoss JIRA] (TEIID-2717) Issues with unrelated sort over a union

[Steven Hawkins (JIRA)]

Steven Hawkins created TEIID-2717:
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             Summary: Issues with unrelated sort over a union
                 Key: TEIID-2717
                 URL: https://issues.jboss.org/browse/TEIID-2717
             Project: Teiid
          Issue Type: Bug
          Components: Query Engine
    Affects Versions: 7.7
            Reporter: Steven Hawkins
            Assignee: Steven Hawkins
             Fix For: 8.6


Related to https://community.jboss.org/thread/233978 a query such as:

select e1 || 'a' from (select e1, e2 from pm1.g1 union select e1, e2 from pm1.g2) as x order by e2 || 'b'

will fail to plan and throw TEIID30259.  The issue is that the unrelated sort item should still be an expression symbol, otherwise the assign output logic assumes that it is a must pushdown function.

Also the simpler form without an unrelated expression:

select e1 || 'a' from (select e1, e2 from pm1.g1 union select e1, e2 from pm1.g2) as x order by e2

can have the dup remove and the sort operations combined.

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